What would be the effect of a drug that blocked muscarinic receptors on the smooth muscle of the iris that regulates the size of the pupil?
A. The pupil would dilate.
B. The pupil would constrict.
C. The eye would focus more clearly on near objects.
D. The eye would focus more clearly on distant objects.
E. Blood vessels in the anterior part of the eye would constrict.
A. The pupil would dilate.
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If the length of the absolute refractory period in cardiac muscle cells was the same as it is for skeletal muscle cells ________.
A) it would be much longer before cardiac cells could respond to a second stimulation B) contractions would last as long as the refractory period C) tetanic contractions might occur, which would stop the heart's pumping action D) it would be less than 1?2 ms
A common term for removal of a retained placenta is ________________________
Fill in the blank(s) with correct word
What is the role of DNA helicase during the S phase of interphase?
A) DNA helicase unwinds the two strands of DNA. B) DNA helicase removes the RNA primer and replaces it with DNA. C) DNA helicase catalyzes the addition of nucleotides to the new DNA strands. D) DNA helicase builds RNA primers on the existing DNA strands.
Functional residual capacity is ________
A) the amount of air that is normally inspired or expired B) the volume of air remaining in the lungs after a normal expiration C) the maximum volume of air that can be forcefully exhaled after a normal expiration D) the volume of air remaining in the lungs after forceful expiration